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Abstract: Two dimensional suspensions of spherical colloids subject to periodicexternal fields exhibit a rich variety of molecular crystalline phases. Westudy in simulations the ground state configurations of dimeric and trimericsystems, that are realized on square and triangular lattices, when either twoor three macroions are trapped in each external potential minimum. Bipartiteorders of the checkerboard or stripe types are reported together with morecomplex quadripartite orderings, and the shortcomings of envisioning thecolloids gathered in a single potential minimum as a composite rigid object arediscussed. This work also sheds light on simplifying assumptions underlyingprevious theoretical treatments and that made possible the mapping onto spinmodels.



Autor: Samir El Shawish, Jure Dobnikar, Emmanuel Trizac

Fuente: https://arxiv.org/







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